250 EX Rears.

I'm thinking about putting 20" rears on my wife's 2002 250 EX. I know this will effect the top end speed, but is it bad. She's got a White Brothers slip-on, K&N, and Jetting. Will the bike rev-out faster through the gears now? Thanks.:devil :devil

It is not really bad it takes away some top end but adds low and mid range. And when you have it in 5th and 4th it mite seam to rev a bit higher.